Abstract

A standard quarter wave (λ/4) Fresnel rhomb laterally displaces the output beam with respect to the input beam. This lateral displacement can cause problems when inserting the rhomb in an already aligned optical setup. This note describes the use of two λ/8 rhombs to construct a λ/4 rhomb. The output of the proposed rhomb is colinear with the input beam, and allows a much more flexible optical alignment.

© 1999 Optical Society of America

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References

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  1. M. Born, E. Wolf, Principles of Optics (Pergamon Press, Oxford, U.K., 1987) p. 50.

Born, M.

M. Born, E. Wolf, Principles of Optics (Pergamon Press, Oxford, U.K., 1987) p. 50.

Wolf, E.

M. Born, E. Wolf, Principles of Optics (Pergamon Press, Oxford, U.K., 1987) p. 50.

Other (1)

M. Born, E. Wolf, Principles of Optics (Pergamon Press, Oxford, U.K., 1987) p. 50.

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Figures (3)

Figure 1
Figure 1

(a) Calculated phase shift (thin line) and its derivative (thick line) as a function of the incidence angle for a glass rhomb (n = 1.51). (b) Calculated L/A (thin line) and H/A (thick line) ratios as a function of the incidence angle.

Figure 2
Figure 2

(a) Optical schematic of the (a) standard λ/4, (b) standard λ/2, and (c) unrealized λ/4 rhombs.

Figure 3
Figure 3

(a) Optical schematic of the (a) proposed λ/8, (b) proposed λ/4, and (c) unexplored λ/8 rhombs.

Equations (3)

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δ = 2tan 1 { { cos ( θ i ) [ sin 2 ( θ i )     n 2 ] 1 / 2 } / sin 2 ( θ i ) } ,
L / A = 4 sin 2 ( θ i ) tan ( θ i ) ,
H / A = 1 + 2 sin 2 ( θ i ) .

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